Tài liệu Public-Key Cryptography and Key Management doc

J. Wang. Computer Network Security Theory and Practice. Springer 2009

Chapter 3

Public-Key Cryptography

and Key Management

J. Wang. Computer Network Security Theory and Practice. Springer 2009

Why Public-Key Cryptography?

 To use data encryption algorithms in network communications,

all parities must first agree on using the same secret keys

 Rely on couriers

 Set up a meeting to determine a secret key

 Use postal service, email service, phone service

 …

 However, these conventional methods are inflexible for network

communication applications

 Public-key cryptography (PKC)

 Invented in the 1970’s

 Without the need of sharing prior secrets to distribute secret keys

securely

 Can also be used for authentication

J. Wang. Computer Network Security Theory and Practice. Springer 2009

Chapter 3 Outline

 3.1 Concepts of Public-Key Cryptography

 3.2 Elementary Concepts and Theorems in Number

Theory

 3.3 Diffie-Hellman Key Exchange

 3.4 RSA Cryptosystem

 3.5 Elliptic-Curve Cryptography

 3.6 Key Distributions and Management